What this means: the first listing photo should be at least 635px in both width and height. This is separate from “can I publish?” — it is about how your hero looks in search. We link the Help article below so you can read it yourself.
If you ignore it: the listing still opens. Search and category grids still show a tile — but a tiny hero can look soft next to shops that uploaded a proper first photo. Buyers scroll past before they understand what you sell.
How I fix it: I re-export the first photo so both sides clear 635px — usually with headroom. A size I use often is 2700×2025 (4:3), so one file can clear this rule and the 2000px zoom floor in Rule 01. Or I drop the file into TagPeek and follow the size it shows.
635px is not the same as zoom. An 800px square might pass here while zoom stays off. A big wide file might enable zoom but crop awkwardly in a square thumb — see Rule 04.
这条要求什么：商品页首图宽和高都应至少 635 像素。这跟「能不能上架」不是一回事 —— 说的是搜索里首图怎么被对待。下面附帮助原文链接，你自己核对。
不过会怎样：商品页照样能开。搜索和分类格子里仍有缩略图 —— 但首图太小，旁边店铺用了正常尺寸时，你的图会显得糊、软。买家还没看清卖什么就滑走了。
怎么修：重新导出首图，宽高都超过 635px —— 我通常还会留余量。常用 2700×2025（4:3），一份图同时照顾本条和 规则 01 的 2000px 放大。或者把图丢进 TagPeek，按它给出的尺寸来。
635px 和放大不是一回事。800px 方图可能过本条，但放大仍关着。大宽图可能开放大，却在方格缩略图里裁得难看 —— 见 规则 04。